//元组转数组
type TupleToString<T extends any[], F extends string = ""> = T extends [
  infer L,
  ...infer R
]
  ? TupleToString<R, `${F}${L & string}`>
  : F;
type A1 = TupleToString<["4", "t", "f"]>; //4tf
type A2 = TupleToString<[]>;//''
export {};
